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A novel application of chirped dielectric mirrors for narrow beam focalization is proposed and demonstrated numerically and experimentally. Analogy to temporal dispersion compensation by chirped dielectric mirrors is discussed.
Suppression of detrimental modal interference effects within a cladding-pumped multimode thulium fiber amplifier is achieved using variable bandwidth seed source. The amplifier produced pulse energies of 1.1mJ and peak powers over 20kW at 1956nm.
A high-efficiency continuous-wave laser-diode-pumped Yb:YAG laser has been realized at room temperature by high intensity pumping. The slope efficiency and optical-to-optical conversion efficiency were 77 % and 72 % for the absorbed pump power, respectively.
We report an efficient, high-energy, diode-pumped Yb:CaF2 regenerative amplifier. Energies up to 1.02 mJ at 1045-nm and 5 kHz-repetition rate in 324 fs-long pulses have been obtained with a beam quality factor of M2 =1.1.
We present an atmospheric turbulence simulator based on a spatial light modulator, using phase screens generated by Fourier Transform method. The effects of different atmospheric turbulence on laser beam are successfully demonstrated.
We report a tunable pulsed optical parametric oscillator using a double-prism domain PPLN as simultaneously an electro-optic Q-switch and a parametric generator in a Nd:YVO4 laser. >2.3-kW peak-power eye-safe light was obtained with this system.
We investigate Raman wavelength conversion in CF4-filled hollow-core photonic bandgap fibers. We obtain a record of more than 35% conversion efficiency in a 35cm-long, weakly pressurized, fiber at a peak power of only 2.6kW.
We demonstrate the coherent combination of two solid-core fibers, which are used for nonlinear spectral broadening followed by temporal recompression. 320 fs input pulses coming from a fiber CPA system are split up and independently broadened in the two spatially separated fibers, hence, limitations of individual fibers are lifted. After recombination and compression, sub-30fs pulses were achieved...
We propose and show experimentally uniform axisymmetric spatial filtering of light beams by three-dimensional axisymmetric photonic microstructures. Such gapless structures (similar to photonic crystals) were recorded in bulk of glass. Angular filtering of 25 mrad is demonstrated experimentally.
A simple technique for directly generating a radially-polarized output beam from an ytterbium-doped fiber laser using an intracavity S-waveplate is reported. The laser yielded 7W of output with a corresponding slope efficiency of 67%.
Interaction between a large number of conventional infrared filaments in air leads to the emergence over meter long distance of plasma channels one order of magnitude denser than standard filaments. Simulations reproduce well these features.
By employing a pair of partially overlapped supersonic gas jets, we made a separation of injection and acceleration stages of laser wakefield acceleration and produced stable, quasi-monoenergetic (10–30% FWHM) and tunable (50–300 MeV) electron beams.
Multi-GeV electron acceleration of electrons using intense laser pulses that excite multi-gigavolt fields in plasmas will be discussed. Experimental results with the new BELLA PW-class lasers and supporting simulations will be presented as well as a path forward to apply this acceleration method towards practical machines.
We demonstrate cavity-enhanced HHG with a tailored transverse mode simultaneously allowing for efficient conversion to the XUV and for unparalleled output coupling efficiencies. Due to its purely geometric nature, this method is power scalable.
We demonstrate an on-chip optical phased array fabricated in a CMOS compatible process with continuous, fast (100 kHz), wide-angle (51o) beam-steering that is suitable for applications such as low-cost lidar systems.
A spatial-spectral holographic channelizer and cueing receiver capable of operating 1–110 GHz with sub-MHz resolution, high dynamic range, and 1000 variably programmable channels is presented, along with initial test results in the 10–20 GHz band.
We present a novel approach for non-contact, rapid and chemical-free decontamination of medical device surfaces using near-infrared ultrashort (nano- to femtosecond) pulse lasers. A proof-of-principal experimental platform is validated through multivariable comparison studies.
We will outline recent progress, in the UK ASAIL laser-ion acceleration programme, which aims to advance laser-driven ion beams to the point at which they will become a serious alternative to conventional accelerators for radiotherapy.
A monolayer of MGITC molecules in a gold nanosphere-plane junction is excited by focusing a radially polarized laser beam. A record electromagnetic enhancement factor of 1010 for deterministic SERS experiments has been obtained.
We report on optical non-paraxial beams that exhibit a self-accelerating behavior in radial direction. Hence, the intensity profile evolves on a spiraling trajectory. The beam parameters have been optimized for high contrast and rotation rate.
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